(19)
(11) EP 2 114 006 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.02.2015 Bulletin 2015/08

(43) Date of publication A2:
04.11.2009 Bulletin 2009/45

(21) Application number: 09159199.0

(22) Date of filing: 30.04.2009
(51) International Patent Classification (IPC): 
H02P 6/18(2006.01)
H02P 25/02(2006.01)
H02P 21/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

(30) Priority: 30.04.2008 US 113148

(71) Applicant: Rockwell Automation Technologies, Inc.
Mayfield Heights, OH 44124 (US)

(72) Inventor:
  • Matsuo, Takayoshi
    Brown Deer, WI 53223 (US)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Position sensorless control of permanent magnet motor


(57) Systems and methods of controlling a permanent magnet motor without a mechanical position sensor are provided. In accordance with one embodiment, a motor control system includes an inverter configured to receive direct current (DC) power and output a power waveform to a permanent magnet motor, driver circuitry configured to receive control signals and drive the inverter based upon the control signals, a current sensor configured to determine a sampled current value associated with the power waveform, and control circuitry configured to generate the control signals based at least in part upon a comparison of a flux-producing component of the sampled current value and a flux-producing component of a command reference current value.







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